Question:
80 bulbs are selected at random from a lot and their lifetime is hours is recorded as under.
One bulb is selected at random from the lot. What is the probability that its life is 1150?
(a) $\frac{1}{80}$
(b) $\frac{7}{16}$
(c) 1
(d) 0
Solution:
(d) 0
Maximum lifetime a bulb has is 1100 hours. There is no bulb with lifetime 1150 hours.
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